Pump.



J. A. SGHWANTES.

PUMP.

APPLICATION FILED MAR. 21

Patented Mar. 24, 1914 Attorneys COLUMBIA PLANDGRM'H c0, WASHINGTON. n. c.

J U'IiIUS AUGUST SCHWANTES,

OF GREEN BAY, WISCONSIN.

PUMP.

Specification of Letters Patent.

Application filed March 21, 1913.

Patented Mar. 24., 19141. Serial No. 756,040.

To all whom it may concern Be it known that I, JULIUS AUGUST SGHWANTES, a citizen of the United States, residing at Green Bay, in the county of Brown and State of WVisconsin, have invented a new and useful Pump, of which the following is a specification.

This invention relates to pumps and more particularly to the pistons and cylinders of double-acting single cylinder pumps such as used for pumping deep wells.

One of the objects of the invention is to provide a piston utilizing all metal valves designed to close by gravity, thereby dispensing with the use of springs such as commonly employed.

A further object is to provide means whereby large pieces of stone or other objectionable substances, are kept out of the cylinder of the pump.

A further object is to provide means whereby chafing of the piston rod is prevented and a smooth operation of the pump thus effected.

A further object is to avoid the use of valves on either end of the cylinder and which open directly thereinto.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangementof parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention here-in disclosed, can be made within the scope of what is claimed, without departing from the spirit of the inven tion.

In the accompanying drawings the preferred form of the invention has been shown. a

In said drawings :-Figure 1 is a central longitudinal section through the pump, parts being broken away. Fig. 2 is a similar View taken at right angles to Fig. 1.

Referring to the figures by characters of reference 1 designates the cylindrical metal cylinder of the pump the lower end of which is closed by means of a screw cap while its upper end is threaded into a coupling 3 adapted to engage a suspension pipe, not shown. The coupling 3 has a rounded seat 4 therein for the reception of the rounded portion 5 of a head 6, this head being provided with a central opening 7 within which a piston or sucker rod 8 is provided with adapted to reciprocate. Any suitable packing means, such as shown. generally at 9, may beemployed for preventing leakage around the rod 8 within the opening 7.

Fitted upon the lower end of the sucker rod 8 is a bushing 10 provided, at its lower end, with a spider 11 the lower edges of which are concaved, as shown at 12, to form a valve seat. Bushing 10 is exteriorly screw threaded and has an annular flange 13 above the threaded portion thereof. These external threads are designed to engage threads formed within the upper end of a hollow piston let. The lower portion of this piston fits snugly within the cylinder 1, as shown at 15, suitable packing 16 being provided whereby leakage past the piston is prevented. The upper portion, however, of the piston is spaced from the wall of the cylinder so that water is free to circulate around the piston.

A transverse passage 17 is formed within the piston 14 at a point adjacent the center thereof and the bottom of this passage is provided with an opening 18 normally closed by a ball valve 19 which is located in the passage. The top of passage 17 is provided with an opening20 sufliciently large to permit the ball 19 to be dropped into the passage 17 and onto its seat. This opening 20 is adapted to receive an exteriorly threaded ring 21 which serves not only to retain the ball 19 in the passage 17 but also constitutes a seat for a ball valve 22 arranged within the piston and between ring 21 and the spider 11. Any suitable means, such as ribs 23, may be provided for preventing the valves 19 and 22 from shifting laterally away from their seats. The aperture 18 opens into a substantially U-shaped passage 24 formed in the bottom portion of the piston la and extending over and along opposite portions of a socket or recess 25. The upper end of a pipe or sucker rod 26 is fitted within the recess 25 and the lower end of this pipe 26 is fitted within a recess 27 formed in the upper end of the top section 28 of the lower piston 29. This top section is made up of arcuate webs upstand mg from a ring 30 and connecting the socket portion 27 to the ring. The bottom section 31 of the lower piston has its lower end lit-ted snugly within the cylinder 1 and suitable packing, such as shown at 3;. This bottom section is hollow and is coupled to the top section 28 by means of a bushing 33 having a spider 34 at the lower end thereof and which is similar to the spider 11 hereinbefore' described. A passage 35 extends through the piston and is provided, in its top, with an opening 36 normally closed by a ball valve 37. Another ball valve 38 is mounted on the bushing 33 and below and between the webs forming part of the upper section 28 of the pistpn. Cylinder 1 is provided with a plurality of inlet openings 39 near its lower end.

In the two figures of the drawings the pistons are shown at the end of their downward stroke and at the beginning of their upward stroke. All of the valves 19, 22, 37 and 38 are upon their respective seats. When the two pistons begin to move upwardly the lower piston tends to create a vacuum because the valve 38 is forced down onto its seat 33 by the weight of the water in the pipe or sucker rod 26. The formation of this partial vacuum between the lower piston and the screw cap 2 will cause the valve 37 to be lifted off of its seat and, therefore, liquid will be free to flow through passage 35 and upwardly past valve 37 into the hollow lower section 31 of the piston and thence downwardly into the space between the piston and the cap 2. This movement of the liquid is produced by atmospheric pressure and gravitation as long as the piston travels upwardly. During this same upward movement of the pistons, the liquid within the cylinder 1 and above the upper piston 14 is placed under pressure and thus is caused to escape through the passage 17 and up through ring 21, thereby lifting the valve 22 against the spider 11. The water, in escaping, will flow around the elevated ball and through the spider into the sucker rod 8. Upon beginning the downward stroke of the pump, all of the valves become seated and, therefore, the liquid which entered below the lower piston, is displaced upwardly as said piston descends and travels overthe seated valve 37 and against the next valve 38, thus lifting said valve 38 oif of its seat so that the liquid is thus free to flow upwardly between the webs 28 and through socket 27 into the sucker rod 26. From this rod the liquid enters the socket 25 and then passes into the hollow piston 14. from which it escapes, through the spider 11, into the sucker rod 8. During this downward movement of the lower piston the upper piston is creating a partial vacuum in the space between the piston and the head 6 and liquid is thus caused to flow from the apertured portion of the casing 1 upwardly through passage 24:. so as to lift valve 19 off of its seat, whereupon the liquid will flow through the transverse passage 17 into said space above the upper piston. Upon the completion of the down stroke, the movement of the pistons is reversed, whereupon the operation hereinbefore described is repeated.

It is to be understood of course that the casing 1 is to be placed deep enough in a well to entirely submerge the inlet openings 39 and thus keep constantly filled the space surrounding the sucker rod 26 and the lower piston. 7

WVhat is claimed is 1. A pump including a casing having a closed lower end and an inlet above said end, upper and lower hollow pistons, a lower sucker rod connecting the pistons and opening thereinto, an upper sucker rod extending from the upper piston, an upper valve within each piston and held upon its seat by downward pressure thereon, thereby to shut off the passage of liquid longitudinally through the piston from the sucker rod thereabove, that portion of each piston below its upper valve being hollow and in constant communication with the space be-' low the piston, a transverse passage in each piston and in constant communication with the space above the piston,'and a gravity seated valve in each piston and normally closing communication between the transverse passage and the lower interior portion of the piston.

2. A pump including a casing, a hollow piston therein and having a bottom opening and a top outlet, an upper gravity valve in the, piston and normally closing the outlet, a transverse passage in the piston and communicating with the space above the piston, and a gravity valve for normally closing communication between said passage and the bottom opening of the piston.

3. A pump including a casing, upper and lower hollow pistons therein each having a bottom opening and a top outlet, an upper the piston and normally gravity valvein closing the outlet, a transverse passage 1n the piston and communicating with the space above the piston, and a gravity valve for normally closing communication between said passage and the bottom opening of the piston, a sucker rod extending from the outletof the upper piston, a sucker rod connecting pistons for directing liquid between the valves in the upper piston, said casing having an inlet constantly opening 7 into the space bet-ween the pistons.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

JULIUS AUGUST SCHWANTES.

Witnesses F. S. GRISWOLD, A. B. FoN'rAIN.

' copiel of this patent may be obtained for five cents each, by addressing the Commissioner 0! Patents. Washington, D. G. v. 

